package com.sunther.document.util;

import com.sunther.idb.file.FileUtil;
import org.apache.commons.fileupload.FileItem;
import org.apache.commons.fileupload.FileItemFactory;
import org.apache.commons.fileupload.disk.DiskFileItemFactory;
import org.apache.poi.ss.usermodel.BorderStyle;
import org.apache.poi.ss.usermodel.CellType;
import org.apache.poi.ss.usermodel.HorizontalAlignment;
import org.apache.poi.ss.usermodel.IndexedColors;
import org.apache.poi.ss.util.CellRangeAddress;
import org.apache.poi.xssf.usermodel.*;
import org.springframework.stereotype.Component;
import org.springframework.web.multipart.MultipartFile;
import org.springframework.web.multipart.commons.CommonsMultipartFile;

import javax.servlet.http.HttpServletResponse;
import java.io.*;
import java.net.URLEncoder;
import java.util.ArrayList;
import java.util.List;

/**
 * @author csb
 * @description: TODO
 * @date 2023/5/19 15:43
 */
@Component
public class ExportExcelUtil {
    //显示的导出表的标题
    private String title;
    //导出表的列名
    private String[] rowName ;

    private List<Object[]> dataList = new ArrayList<Object[]>();

    HttpServletResponse response;

    public ExportExcelUtil() {
    }

    //构造方法，传入要导出的数据
    public ExportExcelUtil(String title, String[] rowName, List<Object[]> dataList, HttpServletResponse response){
        this.dataList = dataList;
        this.rowName = rowName;
        this.title = title;
        this.response = response;
    }

    /*
     * 导出数据
     * */
    public void export() throws Exception {
        try{
            XSSFWorkbook workbook = getWorkbook();
            if(workbook !=null){
                try
                {
                    String fileName = this.title+"_" + String.valueOf(System.currentTimeMillis()).substring(4, 13) + ".xlsx";
                    fileName = URLEncoder.encode(fileName,"UTF-8");
                    //String headStr = "attachment; filename=\"" + fileName + "\";filename*=UTF-8''\"" + fileName + "\"";
                    response.setContentType("APPLICATION/OCTET-STREAM;charset=utf-8");
                    //response.setHeader("Content-Disposition", headStr);
                    response.setHeader("Content-Disposition", "attachment;filename=\"" + fileName + "\";filename*=utf-8''" + fileName);
                    OutputStream out = response.getOutputStream();
                    workbook.write(out);
                }
                catch (IOException e)
                {
                    e.printStackTrace();
                }
            }

        }catch(Exception e){
            e.printStackTrace();
        }

    }


    /*
     * 生成文件
     * */
    public MultipartFile getMultipartFile(String tempPath) throws Exception {
        try{
            XSSFWorkbook workbook = getWorkbook();
            if(workbook !=null){
                String fileName = this.title+"_" + String.valueOf(System.currentTimeMillis()).substring(4, 13) + ".xlsx";
                String path = tempPath+"std_status_check/";
                FileUtil.createFolderTree(path);
                String filePath = path + fileName;
                FileOutputStream out = new FileOutputStream(filePath);
                workbook.write(out);
                File file = new File(filePath);
                FileItem fileItem = createFileItem(file, "file");
                MultipartFile multipartFile = new CommonsMultipartFile(fileItem);
                return multipartFile;
            }else{
                throw new Exception("");
            }

        }catch(Exception e){
            e.printStackTrace();
            throw new Exception("");
        }
    }

    private FileItem createFileItem(File file, String paramName) {
        FileItemFactory factory = new DiskFileItemFactory(16, null);
        FileItem item = factory.createItem(paramName, "multipart/form-data", true, file.getName());
        int bytesRead = 0;
        byte[] buffer = new byte[8192];
        try {
            FileInputStream fis = new FileInputStream(file);
            OutputStream os = item.getOutputStream();
            while ((bytesRead = fis.read(buffer, 0, 8192)) != -1) {
                os.write(buffer, 0, bytesRead);
            }
            os.close();
            fis.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
        return item;
    }

    private XSSFWorkbook getWorkbook()  throws Exception {
        XSSFWorkbook workbook = new XSSFWorkbook();                        // 创建工作簿对象
        XSSFSheet sheet = workbook.createSheet(title);                     // 创建工作表

        // 产生表格标题行
        XSSFRow rowm = sheet.createRow(0);
        XSSFCell cellTiltle = rowm.createCell(0);

        //sheet样式定义【getColumnTopStyle()/getStyle()均为自定义方法 - 在下面  - 可扩展】
        XSSFCellStyle columnTopStyle = this.getColumnTopStyle(workbook);//获取列头样式对象
        XSSFCellStyle style = this.getStyle(workbook);                    //单元格样式对象

        sheet.addMergedRegion(new CellRangeAddress(0, 1, 0, (rowName.length-1)));
        cellTiltle.setCellStyle(columnTopStyle);
        cellTiltle.setCellValue(title);

        // 定义所需列数
        int columnNum = rowName.length;
        XSSFRow rowRowName = sheet.createRow(2);                // 在索引2的位置创建行(最顶端的行开始的第二行)

        // 将列头设置到sheet的单元格中
        for(int n=0;n<columnNum;n++){
            XSSFCell  cellRowName = rowRowName.createCell(n);                //创建列头对应个数的单元格
            cellRowName.setCellType(CellType.STRING);                //设置列头单元格的数据类型
            XSSFRichTextString text = new XSSFRichTextString(rowName[n]);
            cellRowName.setCellValue(text);                                    //设置列头单元格的值
            cellRowName.setCellStyle(columnTopStyle);                        //设置列头单元格样式
        }

        //将查询出的数据设置到sheet对应的单元格中
        for(int i=0;i<dataList.size();i++){

            Object[] obj = dataList.get(i);//遍历每个对象
            XSSFRow row = sheet.createRow(i+3);//创建所需的行数

            for(int j=0; j<obj.length; j++){
                XSSFCell  cell = null;   //设置单元格的数据类型
                if(j == 0){
                    cell = row.createCell(j,CellType.NUMERIC);
                    cell.setCellValue(i+1);
                }else{
                    cell = row.createCell(j,CellType.STRING);
                    if(!"".equals(obj[j]) && obj[j] != null){
                        cell.setCellValue(obj[j].toString());                        //设置单元格的值
                    }else{
                        cell.setCellValue("");
                    }
                }
                cell.setCellStyle(style);                                    //设置单元格样式
            }
        }
        //让列宽随着导出的列长自动适应
        for (int colNum = 0; colNum < columnNum; colNum++) {
            int columnWidth = sheet.getColumnWidth(colNum) / 256;
            for (int rowNum = 0; rowNum < sheet.getLastRowNum(); rowNum++) {
                XSSFRow currentRow;
                //当前行未被使用过
                if (sheet.getRow(rowNum) == null) {
                    currentRow = sheet.createRow(rowNum);
                } else {
                    currentRow = sheet.getRow(rowNum);
                }
                if (currentRow.getCell(colNum) != null) {
                    XSSFCell currentCell = currentRow.getCell(colNum);
                    if (currentCell.getCellType() == CellType.STRING) {
                        int length = currentCell.getStringCellValue().getBytes().length;
                        if (columnWidth < length) {
                            columnWidth = length;
                        }
                    }
                }
            }
            if(colNum == 0){
                sheet.setColumnWidth(colNum, 25);
            }else{
                int colWidth = sheet.getColumnWidth(colNum) * 2;
                if(colWidth<255*256){
                    sheet.setColumnWidth(colNum, Math.max(colWidth, 3000));
                }else{
                    sheet.setColumnWidth(colNum,6000 );
                }
            }
        }
        return workbook;
    }
    /*
     * 列头单元格样式
     */
    public XSSFCellStyle getColumnTopStyle(XSSFWorkbook workbook) {

        // 设置字体
        XSSFFont font = workbook.createFont();
        //设置字体大小
        font.setFontHeightInPoints((short)11);
        //字体加粗
        font.setBold(true);
        //设置字体名字
        font.setFontName("Courier New");
        //设置样式;
        XSSFCellStyle style = workbook.createCellStyle();
        //设置底边框;
        style.setBorderBottom(BorderStyle.THIN);
        //设置底边框颜色;
        style.setBottomBorderColor(IndexedColors.BLACK.getIndex());
        //设置左边框;
        style.setBorderLeft(BorderStyle.THIN);
        //设置左边框颜色;
        style.setLeftBorderColor(IndexedColors.BLACK.getIndex());
        //设置右边框;
        style.setBorderRight(BorderStyle.THIN);
        //设置右边框颜色;
        style.setRightBorderColor(IndexedColors.BLACK.getIndex());
        //设置顶边框;
        style.setBorderTop(BorderStyle.THIN);
        //设置顶边框颜色;
        style.setTopBorderColor(IndexedColors.BLACK.getIndex());
        //在样式用应用设置的字体;
        style.setFont(font);
        //设置自动换行;
        style.setWrapText(false);
        //水平居中
        style.setAlignment(HorizontalAlignment.CENTER);
        return style;

    }

    /*
     * 列数据信息单元格样式
     */
    public XSSFCellStyle getStyle(XSSFWorkbook workbook) {
        // 设置字体
        XSSFFont font = workbook.createFont();
        //设置字体大小
        //font.setFontHeightInPoints((short)10);
        //字体加粗
        //font.setBoldweight(XSSFFont.BOLDWEIGHT_BOLD);
        //设置字体名字
        font.setFontName("Courier New");
        //设置样式;
        XSSFCellStyle style = workbook.createCellStyle();
        //设置底边框;
        style.setBorderBottom(BorderStyle.THIN);
        //设置底边框颜色;
        style.setBottomBorderColor(IndexedColors.BLACK.getIndex());
        //设置左边框;
        style.setBorderLeft(BorderStyle.THIN);
        //设置左边框颜色;
        style.setLeftBorderColor(IndexedColors.BLACK.getIndex());
        //设置右边框;
        style.setBorderRight(BorderStyle.THIN);
        //设置右边框颜色;
        style.setRightBorderColor(IndexedColors.BLACK.getIndex());
        //设置顶边框;
        style.setBorderTop(BorderStyle.THIN);
        //设置顶边框颜色;
        style.setTopBorderColor(IndexedColors.BLACK.getIndex());
        //在样式用应用设置的字体;
        style.setFont(font);
        //设置自动换行;
        style.setWrapText(false);

        return style;

    }
}
